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Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of net periodic benefit cost

The components of net periodic benefit cost for the three months ended June 30 were as follows ($ in millions):

 
Pension benefits
 
Other retirement benefits
 
Total
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
2.5

 
$
2.3

 
$
0.3

 
$
0.4

 
$
2.8

 
$
2.7

Interest cost
3.7

 
3.8

 
0.3

 
0.2

 
4.0

 
4.0

Expected return on assets
(4.3
)
 
(4.1
)
 

 

 
(4.3
)
 
(4.1
)
Amortization of prior service credit
(0.3
)
 
(0.4
)
 

 

 
(0.3
)
 
(0.4
)
Recognized actuarial losses
2.3

 
2.2

 

 

 
2.3

 
2.2

Net periodic benefit cost
$
3.9

 
$
3.8

 
$
0.6

 
$
0.6

 
$
4.5

 
$
4.4


 
Pension benefits
 
Other retirement benefits
 
Total
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
U.S. plans
$
3.1

 
$
3.2

 
$
0.6

 
$
0.6

 
$
3.7

 
$
3.8

International plans
0.8

 
0.6

 

 

 
0.8

 
0.6

Net periodic benefit cost
$
3.9

 
$
3.8

 
$
0.6

 
$
0.6

 
$
4.5

 
$
4.4


The components of net periodic benefit cost for the six months ended June 30 were as follows ($ in millions):

 
Pension benefits
 
Other retirement benefits
 
Total
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
5.0

 
$
4.6

 
$
0.7

 
$
0.7

 
$
5.7

 
$
5.3

Interest cost
7.4

 
7.7

 
0.5

 
0.5

 
7.9

 
8.2

Expected return on assets
(8.6
)
 
(8.1
)
 

 

 
(8.6
)
 
(8.1
)
Amortization of transition obligation
0.1

 

 

 

 
0.1

 

Amortization of prior service credit
(0.7
)
 
(0.8
)
 

 

 
(0.7
)
 
(0.8
)
Recognized actuarial losses
4.7

 
4.3

 

 

 
4.7

 
4.3

Net periodic benefit cost
$
7.9

 
$
7.7

 
$
1.2

 
$
1.2

 
$
9.1

 
$
8.9


 
Pension benefits
 
Other retirement benefits
 
Total
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
U.S. plans
$
6.3

 
$
6.4

 
$
1.2

 
$
1.2

 
$
7.5

 
$
7.6

International plans
1.6

 
1.3

 

 

 
1.6

 
1.3

Net periodic benefit cost
$
7.9

 
$
7.7

 
$
1.2

 
$
1.2

 
$
9.1

 
$
8.9